APA

Ward R. C., . (1975). Principles of hydrology. London: McGraw-Hill.

Chicago

Ward R C, . 1975. Principles of hydrology. London: McGraw-Hill.

Harvard

Ward R. C., . (1975). Principles of hydrology. London: McGraw-Hill.

MLA

Ward R C, . Principles of hydrology. London: McGraw-Hill. 1975.